Changes

const T* in, // source data T* out, // output data int size, // size of source, output data sets R reduce, // reduction expression C combine, // combine expression S scan_fn, // scan function (exclusive or inclusive) T initial // initial value

/* int tile size = (n - 1)/ntiles + 1; reduced[tid] = reduce(in + tid * tilesize,itile == last_tile ? last_tile_size : tile_size, combine, T(0)); #pragma omp barrier #pragma omp single */ int nthreads = 1; if (size > 0) { // requested number of tiles int max_threads = omp_get_max_threads(); T* reduced = new T[max_threads]; T* scanRes = new T[max_threads];

#pragma omp parallel { int ntiles = omp_get_num_threads(); // Number of tiles int itile = omp_get_thread_num(); int tile_size = (size - 1) / ntiles + 1;